arm: dts: imx: fsl-imx8qm.dtsi: add gpio aliases to fix gpio command

arm: dts: imx: fsl-imx8qm.dtsi: add gpio aliases to fix gpio command

The gpio command currently uses equal bank names "GPIO0_"
for all existing gpio banks, i. e.:

U-Boot# gpio status -a
Bank GPIO0_:
GPIO0_0: input: 0 [ ]
GPIO0_1: input: 0 [ ]
...

Bank GPIO0_:
GPIO0_0: input: 0 [ ]
GPIO0_1: input: 0 [ ]
    ...

So the command is broken, it is not possible to address
a desired bank. Add gpio aliases to fix this.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Anatolij Gustschin <agust@denx.de>